Extruding lead and the like.



EXTRUDING LEADAND THE LIKE.

APPLICATION FILED APR. I8. 1919.

Patented Apr. 29, 1919.

4 SHEETS-SHEET 2.

nun/Zora! fittorne y$z J. STRATTON & E. A. CLAREMONT.

EXTRUDING LEAD AND THE LIKE.

APPLICATION FILED APR. 18, l9l8.

Patented Apr. 29, 1919.

4 SHEETS-SHEET 3.

J. STRATTON & E. A. CLAREMONT.

EXTRUDING LEAD AND THE LIKE.

APPLICATION LED APR.18 191B.

Patented Apr. 29, 1919.

4 SHEET$-SHEET 4.

JOHN STRATTON, OF EDEN, AND ERNEST AL Ll 1.,

ENG 7 TRUDHQ'G Specification of Letters Patent.

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Patented Apr. 29 191L930 Application filed April 18, 1918. Serial No. 229,4207.

To all whom it may concern:

Be it known that we, JOHN STRATTON, a subject of the King of England, residing at Bowden, Cheshire, in England, and ERNEST ALEXANDER CLAREMONT, a subject of the King of England, residing at High Legh, Cheshire, in England, have invented certain new and useful Improvements in Extruding Lead and the like, of which the following is a specification.

This invention relates to the extruding of lead and the like in pipe or other required form.

In presses for extruding lead and the like heretofore in common use, the propelling force has been attained by subjectingclead in a molten condition to the pressure of a hydraulically-driven ram resulting of news sity in intermittent operation, the process being stopped every time the ram has completed its stroke. It has also been proposed I to force molten lead as by means of feed rollers in a continuous process into or through an extruding machine, cooling it at or about the point of its passage where it is extruded through an annular aperture or die, so that it is finally extruded in a solid condition. I

The object of the present invention is to construct an improved machine or series of machines or apparatus by which molten lead or the like is first introduced into the extruding machine, then more or less cooled in a chamber internally in the form of two parallel cylinders intersecting one another to formin cross section approximately the outline of the figure 8 before being acted on by extruding members in the form of interengaging rollers and then extruded in the desired solid form in a satisfactory and practical manner, so that an even continuous flow of the lead or like material can be extruded.

We have discovered by long continued experiments in connection with lead presses that it is impracticable to properly extrude lead in a plastic condition from a press by applying pressure, by means of a continuously acting pump or otherwise, to lead in a molten condition, the friction resulting in p the endeavor to force the lead through the apparatus being so great that the operation fails.

The apparatus according to the present invention, however, receives the lead in a molten condition, but does not apply pressure thereto in this condition, it not being until it has attained a plastic or partly cooled condition in its travel around the circumference'of the sections of the -shaped chamber aforesaid that it receives pressure 1n the extrusion chamber and is forced through a die. Accordingly the main feature of'the present invention is the said 8;- shaped chamber, wherein the lead receives the pressure for the purpose s ecified.

In the accompanylng drawings is shown an example of our invention adapted for the covering of an electric cable with a lead pipe or covering.

Figure 1 is a sectional elevation on the line ABCD of Fig. 2.

Fig. 2 is a sectional plan on the line E-F of Fig. 1, the rollers hereinafter referred to being in perspective.

Fig. 3 is an elevation showing a general view of the complete machine.

Fig. 4 is a plan view of the same, and

Fig. 5 is a vertical section on the line G-H of Fig. 2.

Similar letters refer to similar parts.

We construct the extruding machine as follows a is the main body containing the cham ber aforesaid internally in the form of two parallel cylinders intersecting one another to form in cross section approximately the outline of the figure d. The said chamber is capable of being opened in a vertical plane through the center thereof to permit access of the interior: a designates a hinge on which the two parts of the body a swing apart, a designating hinged bolts pivoted at a and threaded at the opposite ends which pass through slots in projections a i and are furnished with nuts (1 to clamp and secure the two parts of the body a together: a is a wall at right angles to the axes of the cylinders constituting the aforesaid chamber and dividing said chamber into two halves containing a passage a".

In each of the cylinders, extending from one flat side or end to the other and occupying the whole of the chamber diametrically, is a. roller 6 with parallel projecting teeth or longitudinal ribs 0 and intervening spaces 0 so constructed that as the rollers rotate on their axes, the teeth of the one roller engage with the spaces of the other. In the construction illustrated the teeth are shown as slightly helical or wormed, there aaeaeea i y a molten state in any suitable lead pot and being a pair of separately driven rollers 11L, by means of pipes or conduits With-suitable each half of the d-shaped chamber formed by the dividing wall a. The rollers are provided with brass bushes 6 around the shafts or axles b and preferably the axle of each of the rollers is integral therewith and projects at each end, and is supported and works in a bearing in the body of the chamber. At one end the axle may pass through an aperture in the wall of the chamber and be connected with driving mechanism, but the rollers might be otherwise suitably supported and driven. only one of the rollers is to be driven, the axle of but one of said rollers passes through the wall of the chamber.

. The chamber is provided with an extrudiing opening, and its sides in proximity thereto are suitably shaped or inclined to form what may be termed a pressure chanr ber g. The said extruding opening is of the required shape and may have a core or not according to the nature of the material or article to be dealt with. The said opening is preferably so placed that it. is evenly bisected by a plane at right angles the plane of and parallel to and equidistant from the axes of the rollers 12. The chamber is provided with a suitable number of inlets h to receive the molten lead or the like on'the side of the chamber opposite the extrusion opening, the said inlets being preferably in the form of long slots extending from end to end of the chamber and conducting the lead to said chamber from hoppers 72, attached to the body a by threaded bolts k I For the purpose of forming a coverlng of lead or the like on an electric cable or other elongated article when it isnecessary to pass said cable or article through the press, the 8-shaped chamber is divided as aforesaid into two halves by the wall a in which is formed the passage a" communicating with the pressure chamber and through which 'the cable passes, the said passage being provided with a suitably shaped core and die. In the construction illustrated a core-box d is provided which may be bolted to the body die box. Within said box d is also the 'die 6 held in place by means of the nut e and cooperating with a core I in the passage a within which is also an adjustable core holder or sleeve f and an elongated. nut f for holding the core-holder in position.

The operation of the machine is as fol-- lows The lead or the like is reduced to the valves to control the flow (not shown), it is conducted to the hoppers k and fed thence into the g-shapcd chamber by the inlets h. The lead from said inlets is received by the spaces 0 between the teeth 0 and is carried around the cylindrical parts of the chamber inthe direction of the arrows in Fig. 1 (being cooled to the plastic condition in its progress around said periphery). .The rotation of the rollers in thedirection indicated causes the teeth to be separating toward the inlets h to the chamber, and engaging toward the extrusion opening, The teeth are so shaped that when engaging they cause the lead between each successive pair of teeth to be displaced and deposited in the parts g of the pressure chamber. By the continued depositing of the lead as aforesaid, it isforced into the other parts of t e ou'sly through the extruding opening besity of stopping the process to form a pipe pressure chamber and thence continu-- tween the die 6 and core f without the necesor covering around the cable which is being passed through passage 0 and the core.

It will thus be seen that although the lead is fed into the machine in a molten condition it cools and solidifies while being carried around the peripheries of the two halves of the 8-shaped chamber. The latter if desired can be furnished with a cold water jacket or other means wellknown in the art to assist the desired result.

For the purpose of securing a more perfeet discharge of lead from between the teeth a of the rollers b we may momentarily hasten the drive of each of the rollers in advance of the other alternatively, or by its driving one directly and the other indirectly,

alternatively control the impingement of each tooth on the engaging tooth in front or behind as may be found desirable.

' Claims:

1. A machine for extruding lead or the like in the shape of a pipe or other desired form comprising in combination a chamber internally in the form of two parallel cylinders intersecting one another to form in cross sectirn' approximately the outline of the figure 8 and wherein molten lead is partially cooled or-solidified to a plastic condition, revoluble interengagingtoo thed rollers within said cylinders and approximately filling the area thereof, means for introducing molten lead to said s-shaped chamber, a pressure chamber communicating with said chamber and having an extrusion opening, and means for shaping the extruded lead as desired in its passage through said extrusion opening.-

2. A machine for extruding lead or the like in the shape of a pipe or other desired form, comprising in combination a chamber 3 homes internally in the form of two parallel cylinders intersecting one another to form in cross section approximately the outline of the figure 8, and wherein molten lead is 5 partially cooled or solidified to a plastic condition, revoluble rollers having interengaging longitudinal projections or teeth Within said cylinders and approximately filling the area thereof, means for introducing molten lead to said chamber, a pressure chamber communicating with said chamber and having an extrusion opening, a cooperating core and die within said pressure chamber and means for conducting a cable or other article through the core-die and extrusion opening for covering same with the extruded lead.

3. A machine for extruding lead or the like in the shape of a pipe or other desired form, comprising in combination a chamber in the form of two parallel cylinders intersecting one another to form in cross section approximately the outline of the figure & and wherein molten lead is partially cooled or solidified to a plastic condition, said chamber being divided into'halvesby a vertical wall at right anglesto the axes of the cylinders to form a passage through same, separate pairs of revoluble rollers having inteeth within each half of the chamber on either side of said dividing wall and approximately filling the area of said cylinders, separate means for introducing molten lead to each of said cylinders of the chamterengaging longitudinal projections or ber, a pressure chamber communicating with said chamber and having an extrusion opening and a cooperating core and die within said chamber through which and the aforesaid passage a cable or other article may be 40 conducted to receive a covering of lead issuing from said extrusion opening.

4. A machine for extruding lead or the like in the shape of a pipe or other desired form, comprising in combination a chamber internally in the form of two parallel cylinders intersecting one another to form in cross section approximately the outline of the figure 8 and wherein molten lead is partially cooled or solidified to a plastic condi tion, revoluble interengaging toothed rollers within said cylinders and approximately filling the area thereof, means for introducing molten lead consisting of two elongated hop- 4 per receptacles having elongated passageways leading therefrom to elongated openings in the chamber, one in each section thereof, a pressure chamber communicating with said chamber and having an extrusion opening, and means for shaping the eX- trude'd lead as desired in its passage through said extrusion.

In witness whereof we have signed this specification in the presence of two witnesses.

JOHN STRATTON.

ERNEST ALEXANDER GLAREMONT. Witnesses:

FRED. CANDLIN, C. A. NEALE. 

